<template>
  <div id="app">
    <span>全选:</span>
    <input type="checkbox" v-model="cheked"/>
    <button @click="fn">反选</button>
    <ul>
      <li v-for="item in arr" :key="item.name">
        <input type="checkbox" v-model='item.c' />
        <span>{{item.name}}</span>
      </li>
    </ul>
  </div>
</template>

<script>

export default {
 data() {
    return {
      arr: [
        {
          name: "猪八戒",
          c: false,
        },
        {
          name: "孙悟空",
          c: false,
        },
        {
          name: "唐僧",
          c: false,
        },
        {
          name: "白龙马",
          c: false,
        },
      ],
    };
 }
 ,computed:{
  cheked:{
   get(){
     return this.arr.every(item=> item.c)
   },set( value){
    this.arr.forEach(item=>item.c= value)
   }
  }
 },methods:{
  fn(){
    this.arr.forEach(item=> item.c=!item.c)
  }
 }
}
</script>

<style>

</style>
